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'''Euclid''' (; , ''Eukleidēs'' ; floruit|fl. 300 BCE), sometimes called '''Euclid of Alexandria''' to distinguish him from Euclid of Megara, was a Greek mathematics|Greek mathematician, often referred to as the "father of geometry". He was active in Alexandria during the reign of Ptolemy I|Ptolemy I (323–283 BCE). His ''Euclid's Elements|Elements'' is one of the most influential works in the history of mathematics, serving as the main textbook for teaching mathematics (especially geometry) from the time of its publication until the late 19th or early 20th century.Ball, pp. 50–62.Boyer, pp. 100–19.Macardle, et al. (2008). ''Scientists: Extraordinary People Who Altered the Course of History.'' New York: Metro Books. g. 12. In the ''Elements'', Euclid deduced the principles of what is now called Euclidean geometry from a small set of axioms. Euclid also wrote...
Birth dateMid-4th century BCE
Death dateMid-3rd century BCE
ResidenceAlexandria, Hellenistic Egypt
Known for{{ublist |Euclidean geometry |Euclid's Elements|Euclid's ''Elements'' |Euclidean algorithm}}
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